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VulnerabilityPublished

CVE-2026-115574: zulip · Missing Authorization

Affects zulipSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 12.2 when convenient.

Data as of 4 Nov 2026, 19:43 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.15.3
Patch
Available – fixed in 12.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

Upgrade zulip and zulip/zulip to 12.2.

Affected software

ProductAffectedFixed in
zulipzulipAffected
  • >=11.0 <12.2
Fixed in
  • 12.2
GitHubzulip/zulippkg:github/zulip/zulipOther threatsAffected
  • >=11.0 <12.2
Fixed in
  • 12.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Zulip to version 12.2 or later, where this missing authorization check has been fixed. No other mitigations are indicated by the vendor advisory.

Description

Zulip versions from 11.0 up to but not including 12.2 had a missing authorization check in the GET /json/users endpoint when web-public channels were enabled. This flaw allowed unauthenticated users to access every user's custom profile field values by using the include_custom_profile_fields=true parameter. The issue was resolved in version 12.2.

References

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